Preheat the oven to 350 degrees Fahrenheit, and line a 8-inch square baking pan with parchment paper.

Mash the bananas in a large mixing bowl until creamy. Add in the peanut butter, pure maple syrup, avocado oil, and pure vanilla extract and mix well until combined.

Transfer the oats, protein powder, sea salt, and ground cinnamon (the dry ingredients) to the bowl with the wet ingredients and mix well. Stir in 1 cup of your choice of add-ins - chocolate chips, chopped nuts, seeds, and dried fruit such as dried cranberries or raisins are all great options.

Spread the protein bar mixture into the prepared baking dish, creating an even layer. If you’d like, sprinkle the top with extra goodies like chocolate chips or nuts.

Bake on the center rack of the preheated oven for 18-22 minutes, or until the edges are golden-brown and the center appears set up.

Allow the protein bars to cool to room temperature before slicing and serving.